New Delhi, Nov. 1 -- Part of our dying heritage is the dance of two Indian strangers as they approach each other on the street of an advanced economy. They avert their gaze, lower their heads, veer a little, as though to escape being bound by the same origin story. It is a ritual of sophistication, and it had its heydays when the chances were high that two Indians on such a street were from the upper class.

Now something has changed, at least in London. There are so many Indians in any given hour that they ignore each other, or they just gape because most of them are poor or lower-middle-class migrants. They are here to do work that English people had said they would do themselves after driving away Europeans in the name of Brexit.

The ...